Rolling barrier

In an enclosed area having a machine therein through an opening defining a plane a rolling barrier for selectively limiting access to the enclosed area and being disposed adjacent the opening, the rolling barrier comprising:

• a supporting structure disposed about the opening the supporting structure including sideframes disposed on opposite sides of the opening the sideframes including central channels each having a width that tapers down from top to bottom of the sideframes;
• a roller mounted for rotation on the supporting structure and disposed above the opening;
• a curtain coupled to the roller for movement between blocking and unblocking positions relative to the opening;
• at least two reinforcing members coupled to and spaced along the curtain and including lateral ends, the lateral ends being received within the respective central channels to maintain the reinforcing member in the plane of the opening, whereby the curtain and reinforcing members are maintained in the plane of the opening for an impact on the curtain or the reinforcing member;
• and
• a detector for detecting when the curtain is in a blocking position and coupled to the machine such that the machine cannot operate until the detector detects the curtain is in the blocking position.